code: def test_comparison_compare_lesser(self):
      const_exp1 = ConstantValueExpression(0)
      const_exp2 = ConstantValueExpression(2)
  
      cmpr_exp = ComparisonExpression(
          ExpressionType.COMPARE_LESSER, const_exp1, const_exp2
      )
      self.assertEqual(
          [True], cmpr_exp.evaluate(self.batch).frames[0].tolist()
      )
      self.assertNotEqual(str(cmpr_exp), None)
  
file_path: evadb/test/unit_tests/expression/test_comparison.py
imports: import unittest
  import pandas
  from evadb.catalog.catalog_type import ColumnType
  from evadb.expression.abstract_expression import ExpressionType
  from evadb.expression.comparison_expression import ComparisonExpression
  from evadb.expression.constant_value_expression import ConstantValueExpression
  from evadb.models.storage.batch import Batch
label_desc: Use image node_id 4 for calling the ComparisonExpressionsTest obj's underlying member method code with example usage: obj.test_comparison_compare_lesser() without return types